Stop mechanism.



No. 690,304. Patented Dec. 3|, IQOI, F. T. LEILICH.

STOP MECHANISM.

(A pplication filed June 24, 1901.)

(No Model.)

WITNESSES.-

[N VENT OR.

a projection 8, extending into a cavity in the UNITED STATES I FRANCIST. LEILICH, OF SAN FRANCISCO, CALIFORNIA.

STOP MECHANISM.

SPECIFZCATION forming part of Letters Patent No. 690,304, dated December190i- Appliceition filed June 24, 1901.

To all whom, it WI/CI/Z/ concern:

Be it known that I, FRANCIS T. LEILIOH, a citizen of the United States,residing in San Francisco, in the county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements in StopMechanisms for Sewing-Machines and other Machinery, of which thefollowing is a specification.

My invention relates to improvements in stop mechanisms for machinery,my object being to provide means by which the moving parts of themechanism to which itis applied can be stopped quickly in a definitiveposition and without shock.

To this end my invention consists in the several matters hereinafterdescribed and claimed.

My invention is particularly adapted to special sewing-machines and isshown as so applied in the accompanying drawings; but it is also capableof other applications.

Figure 1 in the drawings is a side elevation of a portion of asewing-machine with my invention applied, partly broken away to showinterior parts and also showing the stop mechanism in action. Fig. 2 isa plan view and shows the stop mechanism out of action and the drivingmechanism in action. Fig. 3 is a front elevation of my inventiondetached from the machine and also broken away to show interior parts.Fig. 4 is a rear elevation of Fig. 3, but with the driving-pulleyremoved, the hub and stud upon it being shown in crosssection. Figs. 5and 6 are front and rear elevations of a construction in which theresilient device hereinafter described is applied in a difierent form.

The driving mechanism is provided with the fixed and loose pulleys 1 2,over which a driving-belt 3 is moved by a belt-shifter 4, secured to theframe of the stop mechanism 5. The stop mechanism 5 is attached to ashaft 6, moving, as hereinafter described, in bearings 7 7 on themachine-frame, and is adapted to move easily on the outwardly-extendedhub 1 of the fixed pulley 1. Pivoted to the stop-mechanism frame 5 is astop lever 8, (shown in Figs. 1, 2, 3, and 4,) provided withstop-mechanism frame 5 through a gap 8 Fig. 4. This cavity contains aplunger 9, which is held against the projection 8 by a spring 10,bearing against a seat 11 at its lower end, the seat 11 serving also asa guide Serial No. 65,1387. (No model.)

to the plunger 9 at its lower end. The leverprojection 8 is held in anormal position by the upper part of the gap 8 against whichit rests,the gap 8 being sufficiently long to permit the necessary downwardmovement of the projection 8 due to the impact of the stud I on thefixed pulley 1. Over the free end of the stop-lever 8 is pivoted arecoil-lever 12, held normally in the path of the stud 1 by a spring 13.In Fig. 6 the path of the stud 1 when approaching the recoillever 12 isshown by dotted arcs, the arrow showing the direction of rotation. Thestud 1 is shown in Fig. 6 in the position of displacing the recoil-lever12. The spring 13 is secured at one end to a pin 13 set in therecoil-lever 12, and at the other to a pin set in the stop-mechanismframe 5. Thepin 13 also acts as a stop to the recoil-lever 12 by Icontacting with a part of the stop-mechanism frame 5 when in its normalposition, as shown in Figs. 1, 2, 3, 4, and 5.

In Figs. 5 and 6 is shown a construction in which the stopping of themoving parts is effected by a slide 15, moving in gibs in thestop-mechanism frame 5 and held in a normal position by a coillever-spring 16, the lever end of which bears against a projection 15 onthe slide 15, the coil being secured to the stopmechanism frame 5 in anysuitable manner. Pivoted to the machine-frame, opposite the free end ofthe shaft 6, is a setting-lever 16,

provided with a projection 16, extending in the path of movement of theshaft 6, an extension 16 contacting when set with the bearing 7 toprevent the setting-lever 16 being drawn down too far by the spring 17,connecting it with the machine-frame, and a similar projection 16,extended in the path of a stop 18, secured to a disk 19, rotated by anysuitable means from the driving-shaft.

A starting-lever 20, connecting with the shaft 6 by a stud 21 andpivoted at 22 to the machine-frame, is provided to move the stopmechanism out of action and the driving mechanism into action bylift-ing the free end of the lever 20 by any suitable means. spring 20is interposed between the lever 20 and the machine-frame to quickly movethe stop mechanism into action and throw the driving mechanism out ofaction when released, as hereinafter described.

In using a machine provided with this invention and in the positionshown in Fig. 1,

with the stop mechanism in action, the operator lifts by any suitablemeans the free end of the starting-lever 20, which through theconnections shown in Fig. 1 moves the stop-mechanism frame 5 andconnected parts hereinbefore described away from the fixed pulley 1 andreleases the stud 1", attached thereto, from its position as heldbetween the respective free ends of the stop-lever 8 and recoil-lever12, as shown in Figs. 1 and and simultaneously therewith moves thedrivingbelt 3 from the loose pulley 2 to the drivingpulley 1. Thestarting of the driving mechanism communicates a rotary movement to thedisk 19 and stop 18, attached thereto. The stop 18 is in consequencemoved out of contact with the projection 16 upon the setting-lever 16",thus permitting the latter, carrying upon it the projection 16 to bedrawn down by the spring 17 to its normal position, in which theextension 16 is in contact with the bearing 7 and the projection 16 isin contact with the end of the shaft 6. The driving mechanism willcontinue in action until the disk 19 and stop 18 have completed arevolution, when the stop 18 will contact with the projection 16 on thesetting-lever 16, lift it, and release the projection 16 from contactwith the end of the shaft 6 and permit the spring 20*, through the lever20 and pivotal connection by the stud 21 to the shaft 6, to quickly movethe stop mechanism into action and simultaneously therewith move thebelt 3 from the fixed pulley 1 to the loose pulley 2, throwingthedriving mechanism out ofaction. The stud 1 on the fixed pulley 1 iscarried forward by the momentum of the moving parts in the direction ofthe arrow shownin Fig. 6, first, striking against the side of therecoil-lever 12, held in its path by the spring 18, which being of justsufficient strength to hold the recoil-lever12 inits normal position, ashereinbefore described, is easily moved out of its path, and then uponthe upper part of the stop-lever 8, compressing the spring 10, throughthe interposed parts 8 9, until the entire energyof moment um has beenabsorbed by the spring 10, when the latter will rebound, carrying withitthe parts 9, 8, and 8 to their normal positions and pushing the stud 1on the fixed pulley 1 backward in its path of movement until it isarrested by the recoil- ]ever 12, which has meanwhile been returned toits normal position by the spring 13 and is thereby brought to adefinitive stopbetweeu the recoil-lever 12 and the stop-lever 8. Therelative position of the stud 1 at that-position in its rotation whenthe stop mechanism is thrown into action to its position when at restbetween the ends of the levers 8 12 may be varied by changing theposition of the stop 18 on the disk 19. For the purpose to which I haveshown this invention as applied I prefer a release-point of about onehundred degrees from the stop position of the stud 1".

It is no part of my invention that the recoillever 12 shall reduce themomentum of the stud l by friction between them. I therefore make thespring 13 light and elastic and depend entirely on the spring 10 toabsorb the energy of momentum of the moving parts and on the lever 12 toprevent the recoil of the stud 1 beyond a definitive point. The stopmechanism can be placed on a lever and moved to and from the fixedpulley 1, and a friction-pulley can be employed instead of the deviceshown without departing from the spirit of the invention.

The gist of my invention lies, therefore, in the combination of arotating stud or shoulder secured to the driving mechanism, a resilientstop arranged to be brought into the path of the rotating stud togradually arrest its motion, and means to limit its recoil and .inconjunction therewith to stop it at a definitive point, with. means formoving and holding the stopping mechanism out of action and the drivingmechanism into action and for automatically throwingthestoppingmechanism into action and the driving mechanism out of action.

What I claim, therefore, is-

1. The combination in a mechanism of the character described, of adriving mechanism, a fixed pulley provided with a stud or shoulder; astopping mechanism having a resilient stop adapted when brought withinthe path of rotation of the said stud, to receive its impact, absorb theenergy of its momentum and bring it to a definitive stop in conjunctionwith means, including a spring, to limit the recoil of the said stud; adevice for moving and holding the said stopping mechanism away from thesaid fixed pulley during the operation of the driving mechanism; andmeans, including a spring, for automatically throwing the stoppingmechanism into action, and for throwing the driving mechanism out ofaction, at predetermined times.

2. The combination in a mechanism of the character described, of adriving mechanism, a fixed pulley provided with a stud or shoulder, anda hub extended outwardly from the side of the fixed pulley; a stoppingmechanism guided in bearings substantially parallel to'the driving-shaftand supported upon the said hub, the stopping mechanism having aresilient stop adapted when brought within the path of rotation of thesaid stud, to receive its impact, absorb the energy of its m0- mentumand bring it to a definitive stop in copjuction with means, including aspring, to limit the recoil of the said stud; a device for moving andholding the said stopping mechanism away from the said fixed pulleyduring the operation of the driving mechanism; and means, including aspring, for automatically throwing the stopping mechanism into actionand for throwing the driving mechanism out of action at predeterminedtimes.

FRANCIS T. LEILICH. W'itnesses:

H. G. LEILICH, N. E. W. SMITH.

